Bedienungsanleitung Junkers MKB 400-3 A (Seite 44 von 116) (Englisch)

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Regulations and operating conditions

6 720 645 817 (2010/09)

6.4 Combustion air

Where combustion air is concerned, ensure that it is not

heavily contaminated with dust and contains no

halogenated compounds. Otherwise there would be a

risk of damage to the combustion chamber and the

secondary heating surfaces. Halogenated compounds

are highly corrosive. These can be contained in spray

cans, thinners, cleaning & degreasing agents and

solvents. Design the combustion air supply so that, for

example, no extract air is drawn in from chemical

cleaners or paint shops. Special requirements apply to

the supply of combustion air in the installation room.

The Suprapur gas condensing boiler is prepared for

balanced flue operation. Balanced flue operation is

possible via the connection set. This is also appropriate,

for example, if the combustion air could be

contaminated.

Routing flue gas in chimney shafts with secondary

ventilation

No cleaning is required if the flue gas is routed through

a chimney shaft with secondary ventilation (Æ Fig. 48 on

page 80).

Routing air and flue gas in countercurrent

Clean the chimney shaft as follows if the combustion air

supply is drawn through the shaft in a countercurrent

(Æ Fig. 52 on page 88):

If dust loads due to fragile chimney pointing are to be

expected, also clean and seal the chimney shaft.

6.5 Combustion air supply

The conditions of installation rooms and the siting of gas

appliances must comply with country-specific

regulations.

For open flue combustion equipment with a total rated

output in excess of 50 kW, the combustion air supply is

deemed to be ensured if an aperture to the outside with

a clear opening of at least 150 cm

(plus 2 cm

for every

kilowatt output above 50 kW rated output) is provided.

The required cross-section may be split over up to two

lines and must be sized to provide the equivalent air flow

rate.

General requirements

• Combustion air vents and lines must never be closed

or covered if appropriate safety equipment cannot

ensure that the combustion equipment can only

operate when the flow cross-section is free.

• The required cross-section must not be restricted by

a closure or grille.

• An adequate supply of combustion air can also be

verified by other means.

Previous use of the

chimney shaft/

chimney

Required cleaning

Ventilation shaft Thorough mechanical

cleaning

Routing flue gas from

gas combustion

Thorough mechanical

cleaning

Routing flue gas from

oil or solid fuel

Thorough mechanical

cleaning; sealing the surface

to prevent vapour from

residues (e.g. sulphur) in the

brickwork permeating the

combustion air

Tab. 24

To avoid having to seal the chimney shaft:

Choose open flue operation or draw in

combustion air via a coaxial pipe inside the

chimney shaft or a separate pipe from

outside.

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